File: cmac.h

package info (click to toggle)
libcrypto++ 8.2.0-2
  • links: PTS
  • area: main
  • in suites: experimental
  • size: 22,780 kB
  • sloc: cpp: 105,015; sh: 7,353; asm: 5,120; makefile: 316
file content (70 lines) | stat: -rw-r--r-- 2,220 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
// cmac.h - originally written and placed in the public domain by Wei Dai

/// \file cmac.h
/// \brief Classes for CMAC message authentication code
/// \since Crypto++ 5.6.0

#ifndef CRYPTOPP_CMAC_H
#define CRYPTOPP_CMAC_H

#include "seckey.h"
#include "secblock.h"

NAMESPACE_BEGIN(CryptoPP)

/// \brief CMAC base implementation
/// \since Crypto++ 5.6.0
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CMAC_Base : public MessageAuthenticationCode
{
public:

	virtual ~CMAC_Base() {}

	CMAC_Base() : m_counter(0) {}

	void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &params);
	void Update(const byte *input, size_t length);
	void TruncatedFinal(byte *mac, size_t size);
	unsigned int DigestSize() const {return GetCipher().BlockSize();}
	unsigned int OptimalBlockSize() const {return GetCipher().BlockSize();}
	unsigned int OptimalDataAlignment() const {return GetCipher().OptimalDataAlignment();}
	std::string AlgorithmProvider() const {return GetCipher().AlgorithmProvider();}

protected:
	friend class EAX_Base;

	const BlockCipher & GetCipher() const {return const_cast<CMAC_Base*>(this)->AccessCipher();}
	virtual BlockCipher & AccessCipher() =0;

	void ProcessBuf();
	SecByteBlock m_reg;
	unsigned int m_counter;
};

/// \brief CMAC message authentication code
/// \tparam T block cipher
/// \details Template parameter T should be a class derived from BlockCipherDocumentation, for example AES, with a block size of 8, 16, or 32.
/// \sa <a href="http://www.cryptolounge.org/wiki/CMAC">CMAC</a>
/// \since Crypto++ 5.6.0
template <class T>
class CMAC : public MessageAuthenticationCodeImpl<CMAC_Base, CMAC<T> >, public SameKeyLengthAs<T>
{
public:
	/// \brief Construct a CMAC
	CMAC() {}
	/// \brief Construct a CMAC
	/// \param key the MAC key
	/// \param length the key size, in bytes
	CMAC(const byte *key, size_t length=SameKeyLengthAs<T>::DEFAULT_KEYLENGTH)
		{this->SetKey(key, length);}

	static std::string StaticAlgorithmName() {return std::string("CMAC(") + T::StaticAlgorithmName() + ")";}

private:
	BlockCipher & AccessCipher() {return m_cipher;}
	typename T::Encryption m_cipher;
};

NAMESPACE_END

#endif